i developed rsi pretty bad in like 2018 and went all in with an ergodox and it didnt help really. true ergo + better posture and actual breaks (and some time off) is the only thing that worked for me

but i will say split keyboard is very nice but ortholinear seemed to reintroduce some strains

i use a normal keyboard with good floating hand posture when typing a lot w no issues these days

What do you mean by true ergo and better posture?